NMR probe having an inner quadrature detection coil combined with a spiral wound outer coil for irradiation

a technology of nmr probe and detection coil, which is applied in the field of nuclear magnetic resonance (nmr) probe and magnetic resonance imaging (mri), can solve the problems of loss of sensitivity and an increase in the complexity of tuning the individual coils, the inability to provide a multi-frequency tuned quadrature probe design, and the inability to achieve multi-frequency tuning quadrature probes. achieve the effect of minimal mutual inductan

Inactive Publication Date: 2005-04-05
AGILENT TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Another object is to provide an NMR probe, which has coils that irradiate different kinds of nuclei, wherein all of the coils are arranged to be mutually transparent and thus have minimal mutual inductance.

Problems solved by technology

Normally, only one outer coil is used as additional saddle coils would strongly couple together or couple to the inner saddle coil, thus resulting in a loss of sensitivity and an increase of complexity in tuning the individual coils.
The process of double tuning decreases the efficiency of the coils, thereby requiring more drive power to cause the desired nuclear resonance transitions.
Accordingly, it can be appreciated that the related prior art does not provide a multifrequency tuned quadrature probe design for an RF probe which has high resolution and with capacity for multifrequency decoupling.
Moreover, the art is lacking such a probe, which has excellent sensitivity and efficient RF power usage and simplicity in structure.

Method used

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  • NMR probe having an inner quadrature detection coil combined with a spiral wound outer coil for irradiation
  • NMR probe having an inner quadrature detection coil combined with a spiral wound outer coil for irradiation
  • NMR probe having an inner quadrature detection coil combined with a spiral wound outer coil for irradiation

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Embodiment Construction

FIG. 1A shows an unassembled birdcage type coil and FIG. 1B shows the assembled coil, wherein an inner cylindrical conductive coil, comprising a conductive, e.g. metal, ring 1 and conductive, e.g. metal, parallely extending legs 2, is inserted within a cylindrical glass, or other non-conductive material, cylinder 3. On the other side, a similar cylindrical glass, or other non-conductive material, cylinder 6 is fitted over an outer cylindrical coil, comprising a conductive, e.g. metal, ring 5 and conductive, e.g. metal, parallely extending legs 4. The glass cylinder 3, having the inner cylindrical coil therein, is fitted within the outer cylindrical coil fitted within glass cylinder or tube 6. As so assembled, the resulting birdcage coil is shown in FIG. 1B.

Advantageously, the inner and outer coils and the component legs 2,4 and rings 1,5 are disposed to be overlapping so that a quadrature 1H detection coil results with capacitance and / or inductive loop coupling. The resonance freque...

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Abstract

A high resolution NMR probe having two or more resonators, an inner resonator which is closely coupled to a sample and is used to stimulate and receive a response from one nuclear species, and an outer resonator to induce transitions in another nuclear species, wherein the resonators may be provided with cooling capability and may be made of superconducting material, and wherein the inner resonator may be a saddle coil or a birdcage coil with capability of being tuned, and wherein the outer resonator may be one or more spiral wound saddle coil.

Description

BACKGROUND OF THE INVENTION1. Field of InventionThis invention relates to a nuclear magnetic resonance (NMR) probe and magnetic resonance imaging (MRI) utilizing radio frequency (RF) signals; and more particularly, to such a probe having an inner detection resonator combined with an outer resonator consisting of a spiral irradiation coil to thereby minimize the mutual inductance between the two resonators. Sensitivity is improved by means of an inner resonator consisting of a birdcage coil or dual saddle coils operated in the quadrature mode. Further sensitivity enhancement is obtained by cooling the resonators, or by fabricating one or more of the resonators from a superconductive material and operating in the superconducting temperature region.2. Related ArtThe following disclosures show related art:1. U.S. Pat. No. 6,100,694, Aug. 8, 2000, W. H. Wong.2. U.S. Pat. No. 6,420,871, Jul. 16, 2002, W. H. Wong, S. Uno, and W. Anderson.3. U.S. Pat. No. 4,694,255, Sep. 15, 1987, C. E. Hay...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G01R33/34
CPCG01R33/34046G01R33/34023
Inventor ANDERSON, WESTONWONG, WAI HAFINNIGAN, JAMES
Owner AGILENT TECH INC
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